期刊
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
卷 56, 期 5, 页码 1517-1529出版社
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10773-017-3291-0
关键词
Quantum private comparison (QPC); Semi-honest third party (TP); Five-qubit entangled state; Correctness; Participant attack
资金
- National Natural Science Foundation of China [61402407]
In this paper, a two-party quantum private comparison (QPC) protocol is proposed by using five-qubit entangled states as the quantum resource. The proposed protocol needs the help from a semi-honest third party (TP), who is allowed to misbehave on his own but not allowed to conspire with the adversary including the dishonest user. The proposed protocol has the following distinct features: (1) One five-qubit entangled state can be used to achieve the equality comparison of two bits in each round of comparison; (2) Neither unitary operations nor quantum entanglement swapping technology is needed, both of which may consume expensive quantum devices; (3) Only Bell measurements and single-particle measurements are employed, both of which can be realized with current quantum technologies; (4) The security toward both the outside attack and the participant attack can be guaranteed; (5) The private information of two parties is not leaked out to TP.
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